The Town of Bow needed to replace a 20-ft, rigid-frame culvert with inadequate scour protection, foundations, and geometry. The roadway serves heavy truck traffic and intersects with NH 3A, a state highway frequently used to bypass a tolled section of I-93 near the Interstate I-89 intersection with I-93. D&K designed a replacement structure to address…
The City of Montpelier needed to replace a 12-ft-high by 70-ft-long retaining wall located within several feet of a home and serving a low-volume residential road. D&K provided survey, civil, geotechnical, and structural engineering and permitting to replace the metal bin wall with a modular concrete block wall system. We also provided bid and construction…
Bull Run Road, a two-lane residential road abutting a perennial stream, underwent a slope failure during a large storm event. Heavy stream flows scoured the toe of the roadway embankment causing the roadway slope to fail and restrict capacity to one lane. The Town of Roxbury secured FEMA funds to evaluate the situation and implement…
The Vergennes 9B Hydroelectric facility is a historic hydroelectric plant on the Otter Creek centrally located in downtown Vergennes. Its penstocks were nearing the end of their service lives, and the facility was in need of reconfiguration and operational improvements. D&K worked with the client to design new penstocks and reconfigure the powerhouse to significantly…
Located downstream of a large flood control dam, the EHC hydroelectric facility includes turbines at two locations along a one-mile-long intake channel and produces approximately 1.26 MW. The owner needed to replace and upgrade various components of the intake, including replacing the headgate lifting frame, replacing the rack-raker system, replacing the existing timber site/retaining walls…
A large storm event washed out most of the approach to one abutment and damaged the superstructure of the Green River Covered Bridge. The Town of Greenfield required long-term repairs and upgrades to this historic resource. D&K evaluated the structure, provided rehabilitation design and permitting assistance, and performed bid and construction contract administration and observation…
Along Otter Creek, a 160-ft-long, 20-ft-high slide occurred on the Gooseneck Bend Road embankment, disrupting the roadway’s stability. The Town of Weybridge secured FEMA funding and engaged D&K to evaluate the failure and design long-term improvements that armored the embankment along the roadway using stone armoring and plantings, stabilizing the immediately adjacent gravel road.
DuBois & King (D&K) provided construction administration and observation services for the installation of new water, sewer, stormwater, phone, cable, and power utilities to serve a new neighborhood within the South Ridge development. Our team reviewed the stormwater collection and treatment systems for compliance with the project permits and state rules. D&K assisted with Act…
In response to repeated storm damage to this 1,900-ft-long, circa 1960s Army Corps granite block protection levee, the Town of Lincoln needed to repair the levee to maintain an acceptable level of service. DuBois & King evaluated the structural, hydrologic and hydraulic, civil, and structural conditions and requirements of this site along the Pemigewasset River….